How friction is occurred??
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friction in simplest term,is a force that opposes motion.it occurs when two surfaces are in contact with each other.
Friction occurs due to the Roughness of surfaces in contact .
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Friction is an unavoidable force. Every moving object experiences friction, which tries to reduce its speed. Friction in a car engine slows it down. Friction on your feet helps you walk. In some of these cases, it would be very useful to reduce friction. If there were no friction in a car's engine, it would use much less fuel when driving around. This would make cars cheaper to run, and less polluting. However, less friction between the tyres and the road would make driving very dangerous, like driving on ice.
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